Buckle



FIG. 1 is a perspective view of the front, bottom and right side of a buckle showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being mirror image thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines form no part of the claimed design. 

CLAIM The ornamental design for the buckle, as shown and described. 